1.Non-Additivity Effect The average Ni-Ni and Nb-Nb distances of amorphous Ni 62.5 Nb 37.5 are very close to their Goldschmidt diameters in the elementary crystalline solids; while the Ni-Nb distance of 2.59 A°in the amorphous structure is shorter than the mean value (2.77 A°) of ...